Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987 Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838 Class Sphaerellaria Haeckel, 1881 Order Sphaerellata Haeckel, 1887 Family †Parvivaccidae Pessagno & Yang, 1989 Subfamily †Acaeniotylinae Yang, 1993 Genus †Acusten Yang, 1993